If a stern thruster is installed on a boat transom with hull extensions or appendages, swim platform brackets, surface piercing drives and other obstructions to the inflow and outflow of the thruster water jet, a substantial reduction in effective thrust will occur.

To significantly improve these situations, thruster diverter cowlings may be bolted to the ends of the stern thruster tube, to direct the water jet away from the obstructions.

The cowlings are not designed to improve stern thruster performance in shallow draft situation where the stern thruster tube has been installed at less than the depth specified in VETUS installation manuals and other document